C, because that is usually what waves are meant for. :)
The atomic number of calcium is 20 which means it has 20 protons and as an atom (not an ion) it also has 20 electrons. These are in four energy levels (1 though 4) .
D is to stop the current and the force can be removed
Certain naturally occurring radioactive isotopes are unstable: Their nucleus breaks apart, undergoing nuclear decay. ... All elements with 84 or more protons are unstable; they eventually undergo decay. Other isotopes with fewer protons in their nucleus are also radioactive.
Answer:
time to do another things !
Explanation:
Here we can not fill in the blank the words like: products, because in many cases, a slower forward reaction can give the better quantity of products.
We can not say that a faster forward reaction gives the products with better quality, because it depend on what are the reactions we mention about.
Personally, I think this is the answer for this question.
It seems that something is missing in this question.
